JPH05337527

PURPOSE:To perform rolling excellent in working efficiency by calculating a friction coefficient between a plate and rolls from the value of a plate speed on the inlet side or on the outlet side of a rolling mill, calculating the limit of rolling reduction free from slip and setting the rolling reduction. CONSTITUTION:The speed of the plate 2 is detected by a detector 3 on the inlet side or on the outlet side when it is rolled. The value of a plate speed obtained by the detector 3 is added to values of a rolling load in rolling, a roll gap, a diameter of a backup roll 5, a diameter of a rolling roll 4, and a plate thickness on the inlet side and a friction coefficient between the plate 2 and the roll 4 is calculated from these values by a well-know rolling theory. The maximum rolling reduction is calculated from this friction coefficient and the rolling reduction of the next rolling is set below the value obtained by the calculation. In this way, generation of slip can be prevented between rolling rolls and a steel strip at the time of a biting.